V2EX state machine

State Machine

Definition / 定义

state machine(状态机):一种用“有限个状态 + 状态之间的转换规则”来描述系统行为的模型。系统在任一时刻处于某个状态,接收输入(事件/条件)后,按照规则转移到另一个状态,并可能产生输出。常用于软件设计、协议、控制系统、编译器与自动机理论等。(更严格的形式常见为 finite state machine,有限状态机)

Pronunciation / 发音

/stet min/

Examples / 例句

A state machine can model a traffic light.
状态机可以用来建模交通信号灯。

In the login flow, we used a state machine to handle retries, lockouts, and timeout transitions reliably.
在登录流程中,我们用状态机来可靠地处理重试、锁定以及超时等状态转换。

Etymology / 词源

state 源自拉丁语 status(“站立、状态、处境”),经古法语进入英语;machine 源自拉丁语 machina(“装置、机械”),也经法语传播。合在一起的 state machine 是现代工程与计算机科学中的术语,字面意思是“用机器式规则来运转的状态体系”,强调“按规则在状态间切换”的机制。

Related Words / 相关词汇

Literary Works / 文学作品举例

  • Introduction to Automata Theory, Languages, and Computation(Hopcroft, Motwani, Ullman)系统讲解有限自动机/状态机模型。
  • Compilers: Principles, Techniques, and Tools(Aho 等,“龙书”)在词法分析等章节大量使用状态机/有限自动机思想。
  • Communication Networks: An Introduction to Teletraffic Theory and Engineering Applications(R. Gallager)及相关网络/协议教材常用状态机描述协议状态与转换。
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